Geishas are not sex workers. They are entertainers selling companionship and entertainment.

Geishas are well educated in the trend of their days, such as songs, poetries, games, literatures etc.

Translating to the modern context vtubers fit the geisha concept perfectly, except they do it over the internet. Vtubers know the cure games current songs and current memes. They entertain and not camwhores who sell sex.